On the quantitation of light emission from cytochrome c in the low quantum yield limit

1980 ◽  
Vol 73 (12) ◽  
pp. 5947-5957 ◽  
Author(s):  
P. M. Champion ◽  
R. Lange
Keyword(s):  
Quantum Yield ◽  
Cytochrome C ◽  
Light Emission ◽  
Yield Limit

Hedgehog ZnO/Ag heterostructure: an environment-friendly rare earth free potential material for cold-white light emission with high quantum yield

2018 ◽  
Vol 124 (11) ◽  
Author(s):  
Puja Bhattacharyya ◽  
Swarupananda Bhattacharjee ◽  
Manoranjan Bar ◽  
Uttam Kumar Ghorai ◽  
Mrinal Pal ◽  
...  
Keyword(s):  
Rare Earth ◽  
Quantum Yield ◽  
White Light ◽  
Light Emission ◽  
White Light Emission ◽  
High Quantum Yield ◽  
Environment Friendly ◽  
High Quantum

[Bmim]2SbCl5: a main group metal-containing ionic liquid exhibiting tunable photoluminescence and white-light emission

2015 ◽  
Vol 51 (15) ◽  
pp. 3094-3097 ◽  
Author(s):  
Ze-Ping Wang ◽  
Jin-Yun Wang ◽  
Jian-Rong Li ◽  
Mei-Ling Feng ◽  
Guo-Dong Zou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Quantum Yield ◽  
White Light ◽  
Light Emission ◽  
Main Group ◽  
White Light Emission ◽  
Group Metal ◽  
Bright Yellow ◽  
Main Group Metal

Presented is an antimony-based photoluminescent material, namely [Bmim]2SbCl5, exhibiting bright yellow and white light photoluminescence with quantum yield as high as 86.3%.

scholarly journals Low-level chemiluminescence of hydroperoxide-supplemented cytochrome c

1980 ◽  
Vol 187 (1) ◽  
pp. 131-140 ◽  
Author(s):  
Enrique Cadenas ◽  
Alberto Boveris ◽  
Britton Chance
Keyword(s):  
Cytochrome C ◽  
Singlet Oxygen ◽  
Light Emission ◽  
Cumene Hydroperoxide ◽  
Present System ◽  
Butyl Hydroperoxide ◽  
Low Level ◽  
Radical Trap ◽  
Organic Hydroperoxides ◽  
Ferricytochrome C

Ferricytochrome c showed low-level chemiluminescence, with a light-emission measured of about 1×103–3×103 counts/s, when supplemented with organic hydroperoxides. Tertiary hydroperoxides (cumene hydroperoxide and t-butyl hydroperoxide) showed a saturation behaviour at about 5mm-hydroperoxide, whereas primary hydroperoxides showed a quadratic dependence on the hydroperoxide concentration. Chemiluminescence depended linearly on cytochrome c concentration, and optimal light-emission was observed at [t-butyl hydroperoxide]/[ferricytochrome c] ratios of 160–500. Hydroperoxide-supplemented ferricytochrome c consumed O2 at a rate of 1.0μmol/min per μmol of cytochrome c; the rate of O2 uptake was linearly related to the concentration of cytochrome c. The Soret absorption band of ferricytochrome c decreased about 64% after incubation with t-butyl hydroperoxide, whereas the 530nm band was almost totally abolished. Light-emission was (a) inhibited competitively by cyanide. (b) inhibited by singlet-oxygen quenchers (e.g. β-carotene), scavengers (e.g. dimethylfuran) and traps (e.g. histidine and tryptophan) and (c) increased by singlet-oxygen-chemiluminescence enhancer 1,4-diazabicyclo[2.2.2]-octane. Superoxide dismutase had no effect on the present system. The participation of free radicals is suggested by the effect of the radical trap 2,5-di-t-butylquinol. Singlet-oxygen dimol emission seems to be mainly responsible for the observed light-emission; a mechanism that can account for the major part of the present experimental observations is proposed.

A self-assembled white-light-emitting system in aqueous medium based on a macrocyclic amphiphile

2017 ◽  
Vol 53 (2) ◽  
pp. 392-395 ◽  
Author(s):  
Wen-Chao Geng ◽  
Yan-Cen Liu ◽  
Yu-Ying Wang ◽  
Zhe Xu ◽  
Zhe Zheng ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Aqueous Medium ◽  
White Light ◽  
Light Emission ◽  
White Light Emission ◽  
High Quantum Yield ◽  
Light Emitting ◽  
High Quantum ◽  
Self Assembled

White light emission was successfully achieved with high quantum yield in a novel FRET platform based on a macrocyclic amphiphile.

scholarly journals Single-Component White Light Emitting CdSexSy Alloy Nanocrystals Through Phosphine-Free Route

2020 ◽  
Author(s):  
Shilpi Jaiswal ◽  
Jyotsana Pathak ◽  
Abhijit Patra
Keyword(s):  
Quantum Yield ◽  
White Light ◽  
Light Emission ◽  
Semiconductor Nanocrystals ◽  
White Light Emission ◽  
Molar Ratio ◽  
Visible Range ◽  
One Pot ◽  
Light Emitting ◽  
Hydrogel Matrix

Semiconductor nanocrystals are promising for display and lighting devices. Herein, we report a facile one-pot synthetic route to fabricate white light emitting CdSexSy nanocrystals with enhanced quantum yield using CdO, S powder, and Se powder as precursors. The phosphine-free route was adopted, employing paraffin oil as the reducing agent and solvent for the fabrication. The optical properties can be effectively tailored by controlling the reaction time and the molar ratio of Se/S. The emission of pristine CdSexSy nanocrystals covered a broad visible range from 400 to 750 nm. The CdSexSy nanocrystals (Se/S = 0.4) exhibited white-light emission with quantum yield of 50 ± 3 % and Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of (0.30, 0.31). The band-edge (~400-450 nm) to trap-state (~550-750 nm) emissions was tuned by controlling the Se/S ratio, and the different shades of white light were obtained. Furthermore, the quantum yield and CIE coordinates of the CdSexSy nanocrystals (Se/S = 0.4) were found to be similar even after 30 days of fabrication, showing the high stability of nanocrystals. The white light emission was retained in nanocrystals-embedded poly(methyl methacrylate) (PMMA) thin film and also in the hydrogel matrix. The one-pot, low-cost, scalable fabrication of white light emitting CdSexSy nanocrystals demonstrated in the present study offers promising scope in the solid-state display applications. <br>

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